Data Sheet - Rev 2.1

11/2008

ACA2604

11

Table 7: Gain Flatness to Best Fit Line

The best fit line is calculated

using the least mean squares

method:

b

x

m

y

+

⋅

=

( )

( )

n

x

x

n

y

x

y

x

m

2

2

∑

∑

∑

∑ ∑

−

⋅

−

⋅

=

n

x

m

n

y

b

∑

∑

⋅

−

=

Performance data on this page measured using application circuit with input photodiode, as shown in Figure 15.

Figure 10: Gain Flatness to Best Fit Line vs. Frequency Over Temperature

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

0

100

200

300

400

500

600

700

800

900

1000

Frequency (MHz)

+85C

+25C

-40C

`

Tilt (dB)

Flatness (dB)

85

5.2

1.2

25

5.8

1.0

-40

6.3

0.8